[WIP] Re: [PATCH] openmp: Fix intermittent hanging of task-detach-6 libgomp tests [PR98738]

[Kwok Cheung Yeung]

On 19/02/2021 7:12 pm, Kwok Cheung Yeung wrote:
> I have included the current state of my patch. All task-detach-* tests pass when 
> executed without offloading or with offloading to GCN, but with offloading to 
> Nvidia, task-detach-6.* hangs consistently but everything else passes (probably 
> because of the missing gomp_team_barrier_done?).
> 

It looks like the hang has nothing to do with the detach patch - this hangs 
consistently for me when offloaded to NVPTX:

#include <omp.h>

int main (void)
{
#pragma omp target
   #pragma omp parallel
     #pragma omp task
       ;
}

This doesn't hang when offloaded to GCN or the host device, or if num_threads(1) 
is specified on the omp parallel.

Kwok